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Re: New article: guillotine shutters

Originally Posted by jb7

...

It's obvious this is a workable thing, it's not a new thing-

Indeed, it is not. It always amazes me how long it takes for somebody to realize what constructors of these gravity guillotine shutters did in the 19th century quite easily - and the manufactures of the same left in the bin of the photographic history soon afterwards.

Re: New article: guillotine shutters

Originally Posted by GPS

And if you wanted to make a De luxe version you could put a small drop of oil between the blades to make it slip with less friction even in more inclined positions. Olive oil (extra virgin) would do...;-)

Re: New article: guillotine shutters

Re: New article: guillotine shutters

Originally Posted by GPS

Indeed, it is not. It always amazes me how long it takes for somebody to realize what constructors of these gravity guillotine shutters did in the 19th century quite easily - and the manufactures of the same left in the bin of the photographic history soon afterwards.

That's a pretty condescending tone you've got there.
Good thing I've discovered the ignore list, I might be using it shortly-

Thanks for the history lesson GPS.

Putting this Victorian invention in a historical context -
films got better, cameras and lenses got smaller.
Guillotine shutters, along with large lenses, got consigned to the bin of history, because mechanical shutters became possible due to smaller optics.

Cut to the 21st century, and again, people want to make exposures with some of those large lenses.

Problem: modern shutters don't fit large lenses.
Problem: Focal Plane shutters not suitable for every camera.
Problem: Packard shutters limited to single speed, larger shutters limited to slower speeds due to physical acceleration/deceleration limits of large blades.

One solution (of many): guillotine shutter.

You see, some people search for solutions to problems, others prefer to tell them how it can't be done, and it's not worth bothering even to try-
and it does get trying, over threads too numerous to mention-

Re: New article: guillotine shutters

I was pleasantly surprised at how consistent the testing revealed the shutter to be. That's excellent. However, I suspect as soon as your rubber band rotted out in a couple months, you'd replace it and have to retest your speeds because of the variety in rubber bands. If there were some sort of synthetic rubber bands or some other sort of crude yet consistent source of spring, that would appeal to me.

The webpage is very thorough and detailed and brought back memories of doing lab reports in high school and college!